Bug Updated to 5.5 - cannot modify colliders

Hi. It's been a long time since my last post but I've been using Unity Linux on a daily basis so first of all I want to thank you for the Linux Editor progress.

Today I finally updated to Unity 5.5 (from 5.4.3f1 to 5.5.0p1 to be more specific) and everything seems to work fine except for one annoying issue I'm experiencing: Whenever I touch the button for editing a Collider 2D (box, circle or any other kind) the handlers for resizing it don't appear anymore. I'm still able to edit colliders by manually entrying values into the Inspector input boxes but not from the collider itself in the Scene view. It doesn't work neither if I try to grab the colliders where the handlers are supposed to be.

I'm using Unity Editor 5.5.0p1 for Linux in Fedora 25. I know it's not officially supported but I never had this issue before and maybe someone else is expericing it or knows a workaround.

Thank you and excuse me for my bad English.